SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7225514a02c0db4c91afa085f5026c4c00676de348c0ce780b99d2e9c7aeb9' 
  AND token = 'vGXQCVholi1jBgZOcF/6da7PCTGp4YwWldQYBqjNBjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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