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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9419badb3dc08df48d2205e47118da08de62659fb639de1213e9fe0756bfb373' 
  AND token = 'T9gEteJD9E+xs3uDXRXuDZR9Ua8ejQv9AwFf1A6jHbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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