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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58e0118732bb32871e9fe29c4bf15864ec1d5a180ee98868500e295027589b9' 
  AND token = 'SSXuQc+YTnhx36ShNJbjzMZN76wBSshqhctVTbYIxJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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