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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4b64dc0cb1ae5275f7a957ff054614d5c64b2f38139c4998420e710cdd24bc' 
  AND token = 'WwMN4aJ8sIyNGUIy9OwmRNSl6HTbJWJWKqcW97K69RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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