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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da3d5c11b24e70dc458527bd7e3255ac3c9423869ea2c9042d0896b3021c53a' 
  AND token = 'KuevUwv1eMWPBOdRCZCFK14SPy5NYYLbiT73PhnEwsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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