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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96a0efa654e9a861456ce9ed6b3c3f12b6131d4525076cc9c43e2a819792b08' 
  AND token = 'cVBbi5DsrT5oGpxf08KPZRexkJKV9zb9skedTre+pJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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