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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687a5b1751b1ab8baabba768afaaa6047ed0da4541665c04c23a4f23e513cb2c' 
  AND token = 'g/9zrDdy9HsGVSNm8Y4G0WsTpPn7wNWC7O7it9zS8L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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