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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597fd9adac8981e1b2c3f8b99c876e7ec8f150931b7ef8bbf608fe9418c3d4c6' 
  AND token = 'XTonvanTfj7SHFY+mtkx8fkIE7v2oio0rEusqXioFdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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