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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd38092d5bf2111051e3756d0d7352816320cac99617e144ccb3afdfb14553aa' 
  AND token = '3O0m7V9SUpnq6pE1xE1UxT19zJUIU+EeYUy8g+34ha0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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