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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9570d2a049f4335655cad3cfbd8422b10ca193ba96e592b6727c0e1b62388e' 
  AND token = 'z04J/t/aSA8t90jEVgt8ueJOZ8jz9EO3BkpM2lZl5/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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