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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315ff37d20575f650ad9e12ca2744b6843d9365240c3f06da6d016b8e370166b' 
  AND token = 'obfcWuHNYn3onMzhWu2QZu47Svz+exHKckWKWuMjjJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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