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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56fde9a381b7c3348748e0d5fd3fe8d64c88fe92cfd3acbd9ff5bea70312909' 
  AND token = 'fKvs+knRA3jmQBAtvlb39YjnnXQQs3RGeCZ1YZ/vTi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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