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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04be17769d6795cbec53be30f7c2e8a6b3d776decb7ba77a5ca79da9b57fbbcd' 
  AND token = 'K5U1QDlCpvb0r9ih8fVX4mcpvl2rV8MQ13DjfUemkeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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