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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef07bb87ae1c87775e12aaed98938d92c5018c15fea75d9c32e3f7729d3943f' 
  AND token = 'BzqMEU1sosQOGw3U1eP/JUo2Z8NP5ikaiuoAsZvGMXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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