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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc04e5e4ddff27e2e36e3146909bdafdb19c33b3de6a186de4b4e42fa7daf1b' 
  AND token = 'C5IdEXCXs8zXZcYmvyTRR1ni3BLKvWsIoaGSmqz052g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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