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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c040bf41b5eedb219c5b9bea542c3813247196090e884b1130bd393bf8b228da' 
  AND token = 'gtO7LxDZK6jyIRokJeRg+ZyA5YrRk76o9Dtmnf+DhZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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