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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed33b04efa339a795da5b7914868b00fcc835b780a01b031bc0ec6ae54a79ac' 
  AND token = '2I+3U2XNoqG1o706OsYGnTh3iNkBqd/SgzqPUYDef1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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