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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603c06d6c68a897922204982a9b8bba8d77f93fccbb569552fc4e9d9aef84539' 
  AND token = 'wDeV1OZ+9P10Ythj65m5ee/qCX80B4z9uhREz0154xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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