SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5ce229f08bc09f9c385ef25c919b424b20e4323ae4ea348716f3ea0b322d4a' 
  AND token = '0JgvKxtWdYPGyLsNpGPlPfXodsSocXlEA+wJ/Kv43jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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