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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4818ec1052dbbd45cab9e982c2bcbad00552a5fdd49f5a09d8eb5eb53c9946' 
  AND token = 'McGqpNYcSJQYpkzkaR4ySavZyekHIOi5+JmN5C/VQDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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