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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac30890d969ad4f2881ba3221a67397bcdd40537cb0f2bb9e4ce2ecb2c40fc2f' 
  AND token = 'SdXmGHPPXIuhLC4xD2U8fcyymFBKlDQx9JkJYm6DVYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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