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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa961fcee0003eb252139b4cbcceb9a7a7e6aacd29fade3bce7cb6556507ab4d' 
  AND token = 'vgQJinfPd8GWn3bV4fqnb520cI6CVc/pk01pBQJpDos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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