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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16fe8e2861a3ccf76703383bc4e02eb9775c5c9b548a8f8d5bba3b55a204cb8' 
  AND token = '79rY8aJ+cATieNHB0Kotoxt20D0WR1IYAGFJylR+ztg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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