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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58248c76a4a39b1fd671613a4524d3dbd9107d01ef32211de9a695c7fa9f5aa9' 
  AND token = '7IFMb7a2QGAUk82DlfZvRcVkQB/Ok5Jhjk0thDiTY0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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