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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea232a702040b4b357e835e5962d8744d919124023779b85dca191af5f879e2' 
  AND token = 'FOdFw8os4Nj4J0Owp4RznQocy/4nnvUKkPyPZIdUTXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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