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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a4370947406d1ffa4144ae80e912944e8a7e1e1a4f42a13439c2ce77e76e19' 
  AND token = 'lT6YXUe7B3oZGblqtpBEHC3ksFI//d6C+R1DMC64vfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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