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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca78f5e5c9e8b41ca3f1c28a84e0e3b3570e269886f716ec0ae163ef5bbcf1e1' 
  AND token = 'bgYMqY3v3YSnIJi6UKYEaQcw0clquDF4RC6QeBSF1G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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