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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2e5302930144f1def3dd88a76b81d28d9cbfddce54976f6f73150147eda8f4' 
  AND token = 'q8tj+1Hr32TvhN28YbHn3gQueL284F3/r0kfgdQJ6GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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