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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef857b705a9ba96a366b611dc3aa37b444205a154a49f1bd3cccd8a9f2bf5de' 
  AND token = 'QrUFUD/lgeHWXuax/ThaIPqa5aiBd2fuUdDQqpVi+AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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