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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f46fc812994d4e91c58e24cc34fca7ea0e4cb9438350b233d8c4908d8e57406' 
  AND token = 'ic/InWQegSpF9EH84lqbqk41D54TDwbv6UJkf539lwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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