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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b5bb9e0192a803c434a8bb137f9846664fe9a045ece348c1dc05a57325760c' 
  AND token = '90nWsZ/6dagBZHTd3s3TO+J289OlKBwpj5H7oyEDHUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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