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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305671fbc8acfeef7a1f1cd8d9758bdf63e3bfb36ff609fd49a5af24c6d9e13b' 
  AND token = 'ZwbJesWeqxa113dxXo/oG1l/Cjvn0AjPxKLCGPCf8HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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