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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65f4f750fffbe921023b3b71c8e6dbc380e935c74ef21b0ecf3d3a7eb623e88' 
  AND token = 'vYH7WIa/dIW+o5Q3StVcHTEvfCKstzNZhfSpwzXAAAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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