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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3b50317cd5a226c0f9b44b54a5c15a47523fad5cc37bd9974c970fd4e0961b' 
  AND token = 'TWbIMdyBPScHXkTsJfVrs7pys8BXOel8TZYPqOs2Dp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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