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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa51836dc1bd0c8fbcc292ce2f051f58d7b37f866ddeee473e59fa65012c6af' 
  AND token = 'vaznNLQcTbepNGOsE76gib8B4WFt/sGghImV6JTeqAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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