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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17412fa7b3d46015cba187e635be7219f0394ed193c0bdcec1804d038f0c8520' 
  AND token = 'TdNbeL5ks9kdf6i5W9E6yoMhrkG8MemT8EFZLi2TFAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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