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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfbef9cf3edfaebbd912dec5ea48d05264d4e54f3302ca0f2747949b9bb0dc1' 
  AND token = 'Y529NUDy8z24BJRk/zSS3SpVhQUHBZ2/mQ4S8gq/G1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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