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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829ae4ef6df6500227a7c8356664127f90af6b18a271033f64f2d96230670f23' 
  AND token = 'WfPut5EWb4gr7VWQrER78YJ3Wd0K1FsWAsqHU/j4N74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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