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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883732aaa4d67ab6b3956933f051d946444dce8311850991765f0ebaa435d86c' 
  AND token = '6pPoJF7kJh3F46eEXTQZI+1QsQr61KIfQNcU1jtUAOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}