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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3d2d15146ee422e3974b2faeaa6036358324175c14bde2f9f9cbdb44a0dfc2' 
  AND token = 'QcIJC4unS0thCckrxEOiGGWA33I1nkiIJxQwd3SfeIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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