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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f79803c4b160f11aafbc19325574ba4dfe7416b3396d08f756d094592065d06' 
  AND token = '+TVeoD1CYmfUyfvZeoxc6O0X4JodWm2Y6oXG6wqIfhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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