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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125876a399ccb30ee9ed885c0baaba3bc3e22a815138b6a5d6e4b8019f723d22' 
  AND token = 'kGJu/WcfwWDXfbLJ0u7ORPKMWl/dkX6rkYYIJiqdDno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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