SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe71b3093f65a02b384db6743cb3452c539227282991cafac0ffa3c2882156a' 
  AND token = 'cpCcCwChiDS3oTvvA6yTiewUFYVwZX+qzDs29/r8Mm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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