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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705c799ff09f3e6e90ad7a51192b6ed57d0b4fb50145d4110f4fba417517de8a' 
  AND token = 'IcC/l47ILvsvVui60YulL/9eFlhiRa9xm23EzCNl5CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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