SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeabd74011358b46b28a71762ffd36b26eab95dd0ab1c4d8485958875238af75' 
  AND token = 'sG7JEQukZjzUQkF79o1L+67YdCwriUOP7Mp+nV6OWvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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