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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6eeaec99b8a514bf4d3e173ee61e0eddf4b6ba2b61e313bd01c8965c45b69c' 
  AND token = '0kqJw0et4D2nuw+PYPZ89vTnmYepV+0MvgDPsKv1Qxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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