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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8da6423b9a0c29b76900f7211720ed70c45942a8dea7190ba2fdf854bf59df4' 
  AND token = 'hqoJPL4tiBrAtlrQmRizlvFCC5wfyfj91f2icFDcbKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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