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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febe5fa071ace4647afcf743ee4bf035519c3b16c5a7fbb2ec62ee3ecc0285cf' 
  AND token = 'df1hvc9t9tCnvMyF0Rw7DcI4OfL4msdFjK6USFDb248=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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