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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6539a7d3e7a81b6ca949ca9f7cd4551727b60558e8b2627949983e9e03f3eeb3' 
  AND token = 'D1oZ9COu8tbMfvCMYTfClycuYDbfTtp4Wm9aFnvs2dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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