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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befab553be15ae084792903b71c00a15149b5164f378d335df8ccf2f720f05b6' 
  AND token = '/WUvhz57JkoBX02+T1RWZl8FHsDC11DuE+QXrZiiNbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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