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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7e9134f779169a87f52a0dbf902e589a563295dd6404ca8aef1b325d4c5cb3' 
  AND token = 'qFl3YQfoiOcMoVgEFbrXsv8203AmgYi/WZxBNb1JNYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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