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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9947311a890f425e578184f1cf357cfbe96196c1b5b90d771a85e184a257d787' 
  AND token = 'kyGXcoJGIgKz/OEpGqLKl6PiOlDqpt8QXFUSc4HGIFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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