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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef361979cc7c0a9cab64a9cb44369de8857101f94ccb527ee6d7542fad4f7204' 
  AND token = '5iHvJY6FRV4Wid8KNV26CFu6sJ83ZRRJNmISlybYn+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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