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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f8a60fef23b65f8c4184d8064b2df73dd7a01eec8fb4e2a2032ac86eef8162' 
  AND token = 'tyncIjUY0nYgBqmnf8liOXUbjbO/kEb+YFbsMs1JmVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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