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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865c0cf3bef6f1cbb8ecf2de222138f4426ec20021ad7dbbd8eaa0ac370e60bc' 
  AND token = 'euCX7TnimC5MvIXq0hAF5E2eclpj2/+q3KmI9HstN1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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