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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342a84a38aedaf1436b2d513ed89bd646d6f7af8a3a17f5b566f916f5faac2cf' 
  AND token = 'IJcDwDlrRvUukmNH8wXiFcvr3ZMsEnORCAbnosG1T+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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