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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70b601fe72b4573cfcae16df4f4fb924d6a4818d8edc07484a2f3a59087f365' 
  AND token = 'qVpHGFgFbU9OCEweLihjt+6VQUdatIoCw7Seao8uxqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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