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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef54cff473ed0c8fd34257ed67bd269bbd70cfbc380f9aa912d6a4f81be06c4' 
  AND token = '7fuyVlsfldcYcifbZTXMryLHzFKDSTJWiVOhQhDHoE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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