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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782ee44b33ba332c5e73d0bca6d33dc8966a674269e2da99cc0c2ab4a0782d13' 
  AND token = '13mBHSZ3gMkVunw8ORXMj5cNLhfwgzl9nxKsAAQvvgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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