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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5733de15e9526e0ef0b9d28b25c91709167569022bb5450db3965f02957d6ddf' 
  AND token = '19kqwipzzWc7k+GFgBOBNJZcleIPrzAb+cEYqND2OBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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