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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6e41e025b1671ade00dc0464cd9d87502bcc85cf4d6251ae1c9ecf37dabf9a' 
  AND token = 'iYzFwSrs9kmYnFXcKFGuGmxsyMteGFs6656NQ5PHxSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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