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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3c2c457617b8e3ef0f48b04e1ad964c6d401466395c2ac2b2379b2c405ccbe' 
  AND token = 'blDqpRCIlyc2YLVk/n3iXmz6LwQu/E13sBQjwb8UGHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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