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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55f8259b55bcdfd8fe8405f40960182f8f5f7f1f2af4de81fe1d35d33357d9e' 
  AND token = '06cpOzJAvd2BCew4H2eBsderFm5+mnZ+D/2fOpStlR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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