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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f44511c5f5fe7228984325941ed8871dee96495c4a2c67c99e793db6d8faeb6' 
  AND token = 'Mk6ZYdDmuRbHQSFd6t6sIb4qyRyIL1s3NPZ3G1bOClQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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