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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320883d3bb2a89776eadb02cdfb0df8c1cd9296e3a654686014451c31f79e0f4' 
  AND token = 'vpE3JfE9cnLbxSe1ctz5ohMkp+PUoB9cmo0LdTsd/hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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