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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930ba2576ff5c1ba269254cf7f65b0c5724694071198c8f4390c4d13d0c43ec6' 
  AND token = 'TiCjuaU+QHiTF3HcEtM8eHo/seTwtp+xS9yKkQTkn3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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