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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164ba712ccc291ca76ec623ff3d3eb2393dc59ad8d2927ce3e6d319c9fe2744d' 
  AND token = 'j7hjBSqI5q2+yH5Ds0J3B4LNNOL6vDJUD9qhqPYsVTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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